Classic/Antique Car Repair: Cadillac electrical systems, volt batteries, electrical systems

Question
Did Cadillac ever use positive ground electrical systems? If so, what was the last year they used them? Did they continue to use positive ground for electronics?

Thanks.

Answer
Kent cadillac used positive ground through the twenties, thirties, and forties. By the time caddie went to twelve volt batteries they were negative ground. The only car that went to positive ground in twelve volt was Packard but that was short lived.
Brad